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The ESO Distant Cluster Survey (EDisCS) is a photometric and spectroscopicstudy of the galaxy cluster population at two epochs, z~0.5 and z~0.8, drawnfrom the Las Campanas Distant Cluster Survey (LCDCS). We report results fromthe initial candidate confirmation stage of the program and use these resultsto probe the properties of the LCDCS. Of the 30 candidates targeted, we findstatistically significant overdensities of red galaxies near 28. Of the tenadditional candidates serendipitously observed within the fields of thetargeted 30, we detect red galaxy overdensities near six. We test therobustness of the published LCDCS estimated redshifts to misidentification ofthe brighest cluster galaxy (BCG) in the survey data, and measure the spatialalignment of the published cluster coordinates, the peak red galaxyoverdensity, and the brightest cluster galaxy. We conclude that for LCDCSclusters out to z~0.8, 1) the LCDCS coordinates agree with the centroid of thered galaxy overdensity to within 25'' (~150 h^{-1} kpc) for 34 out of 37candidates with 3\sigma galaxy overdensities, 2) BCGs are typically coincidentwith the centroid of the red galaxy population to within a projected separationof 200 h^{-1} kpc (32 out of 34 confirmed candidates), 3) the red galaxypopulation is strongly concentrated, and 4) the misidentification of the BCG inthe LCDCS causes a redshift error >0.1 in 15-20% of the LCDCS candidates. Thesefindings together help explain the success of the surface brightnessfluctuations detection method.Comment: 10 pages, 9 figures, accepted for publication in the November 10  issue of Ap

Tests of the Las Campanas Distant Cluster Survey from Confirmation Observations for the ESO Distant Cluster Survey